Scilab Function
Last update : 12/1/2004

freson - peak frequencies

### Calling Sequence

  `fr=freson(h)`

### Parameters

- `h`: `syslin` list
- `fr`: vector of peak frequencies in Hz

### Description

returns the vector of peak frequencies in Hz for the SISO plant `h`

### Examples

    h=syslin('c',-1+%s,(3+2*%s+%s^2)*(50+0.1*%s+%s^2))
    fr=freson(h)
    bode(h)
    g=20*log(abs(repfreq(h,fr)))/log(10)

### See Also

`frep2tf`, `zgrid`, `h_norm`,